Considering how some in society (across generations and cultures) view sexual assault victims, justice, and mental health, I'm not surprised by the old lady in this chapter and some of the comments here. While I don't condone some opinions, I also understand that some people's viewpoints are colored by whether they think other people are inherently good or bad. Too long of a discussion to get into here.
Part of why I enjoy reading Zyugoya's comics is because they focus on the recovery after some traumatic event. Starting a new life after an awful (abusive?) marriage leading to divorce. Sexual assault leading to isolation, but then a reunion. The bad thing in the past which unfairly affects your reputation, so you don't want others to know about it. The anxiety, the fear, the shame. Worry that Touma might be the type of person that might abandon or, worse, use their trauma against them. Because trust can be such a fragile thing. Or when others don't accept a part of us, we blame ourselves for not being some way or fitting into some box. Just as we start climbing out of this hole and we're in danger of falling back down. While grasping at the little bits of hope that come along the way. Somehow Zyugoya has been able to capture this sense of underlying uneasiness since the beginning.
I also think a lot of the anger we feel is because it was Kyouko's secret to tell Touma on her own timeline, and not to hear it from a gossipy neighbor, even if there was no malicious intent (at some level, the old lady seems to be concerned and care for Kyouko). Nonetheless, the old husband's realization that Touma might be hearing this for the first time is telling of this too.